First, I removed the switch plate and figured out the center point. I used a very small drill to start a pilot hole then went progressively bigger until the female/female jack fit. IIRC the jack is about an inch long and I bought it from Radio Shack. Patience is a factor in not making the hole too big. So far mine has worked well, but I keep my XM plugged in to it and don't plug/unplug on a regular basis. Hope that helps.